String. The input identifier used to access the value.
label
String. The radio button label.
choices
Named vector. The option names and underyling values.
selected
The initially selected value (if not specified then defaults to the first value).
color
String. The color of the radio buttons. Leave empty for the default color. Visit https://materializecss.com/color.html for a list of available colors. This input requires using color hex codes, rather than the word form. E.g., "#ef5350", rather than "red lighten-1".